AIR CIRCUIT BREAKER
MT/MVS
ACB (Air Circuit Breaker) is a high-performance low-voltage circuit breaker, with representative models including MT/NT and MVS series, covering rated currents of 630A~6300A, with a formidable breaking capacity of up to 150kA, making it exceptionally suitable for industrial, commercial, and energy distribution systems.
Core features:
Intelligence: Equipped with a state-of-the-art Micrologic release, it supports advanced real-time monitoring (current, voltage, fault recording) and offers seamless remote control, fully compatible with the innovative EcoStruxure platform.
High reliability: Features a robust modular design, offering optional electronic/thermal magnetic protection, with an impressive lifespan rated for tens of thousands of operations.
Comprehensive protection: Ensures reliable overload, short circuit, and ground fault protection, with support for selective coordination.
Flexible Expansion:Can be enhanced with communication modules (Modbus, Ethernet) and auxiliary contacts for diverse applications.
Ideal for data centers, manufacturing facilities, and large-scale buildings, distinguished for its high security, digital management, and efficient energy conservation, all while adhering to IEC/GB standards.
Working principle:
The air circuit breaker consistently monitors the electrical current via a high-precision current transformer, transmitting the data to the intelligent controller.
When the intelligent controller detects any abnormal current, it promptly disconnects the internal contacts of the circuit breaker to safely cut off the circuit, ensuring optimal protection.

Current |
630A-6300A |
Number of pole |
3P 4P |
Breaking Capacity |
N1,N2,H1,H1B,H2,H3,L1 |
Type |
Fixed Drawer |
Model |
MT/NW/MVS |
Product Features: Explore the forefront of technological brilliance and exceptional features woven into our Premium Quality ACB Air Circuit Breaker. Experience unparalleled performance and unwavering reliability that distinguish it in the market.
Δ High-Temperature Resistant & Flame-Retardant Casing: Specially engineered to endure extreme conditions, this casing ensures superior safety and unrivaled durability across all demanding operational environments.
Δ Copper-Plated Silver Alloy Contacts (Dynamic/Static): Revel in the exceptional conductivity and unwavering reliability of our meticulously engineered contacts, crafted to deliver optimal electrical performance with precision.
Δ Silver Alloy Contacts (High Conductivity & Superior Arc Resistance): Embrace the benefits of outstanding conductivity paired with enhanced arc resistance, ensuring seamless and efficient electrical connections at every turn.
Δ Thick Copper-Plated Silver Busbars (Standard In/Out Terminals): Engineered for endurance, our robust busbars guarantee stable and secure current flow, upholding the highest industry standards with every use.
Δ PCB Reliability (48-Hour Aging Test Verified): Place your confidence in our meticulously tested PCBs, verified through comprehensive aging tests to ensure enduring performance and steadfast reliability.
Installation Instructions
· Our MTN and MTH models, ranging from a versatile 800A to an impressive 6300A (with the exception of the 4000A), are meticulously crafted with precision engineering, showcasing the same robust and durable connection terminals;
Effortless installation is essential! There's no need to allocate extra space for the front connection, as our expertly designed terminals maintain the circuit breaker's depth perfectly;
· Whether you're connecting to a horizontal or vertical busbar, our innovative design ensures seamless and flawless integration. Simply adjust the connection terminal by 90 degrees for optimal and precise alignment.
Mechanical Operation Test: Assurance of Seamless Functionality
Meticulously evaluate the mechanical operation of the circuit breaker to guarantee it remains flexible and reliableat all times.
Conduct comprehensive operational function tests, including: closing, opening, and energy storage,ensuring impeccable performance.
Electrical Performance Testing: Your Ultimate Safety Assurance
Insulation Resistance Test: Utilize a megohmmeter to precisely measure the insulation resistance of both main and auxiliary circuits, ensuring they adhere to industry benchmarks (typically ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Impose the rated power frequency voltage (e.g., 2500V for 1 minute) upon both main and auxiliary circuits to rigorously test their insulation capabilities.
Contact Resistance Test: Meticulously gauge the contact resistance of the primary contact to ensure it consistently stays below the specified threshold (usually at the micro-ohm level).
Protection Function Test: Shielding Your Gear with Precision
Scrutinize the action values and timing of protection functions, placing a spotlight on overload, short circuit, and ground fault scenarioswith rigorous examination.
Meticulously validate the settings andfunctionality of the intelligent release device, ensuring it operates at peak efficiency and reliability.
Outer Packaging:
We take pride in ensuring the protection of your valuable products by utilizing exceptionally sturdy wooden boxes that are expertly crafted to deliver superior mechanical strength and durability.
These robust wooden crates are perfectly designed for the safe transport of large circuit breakers, making them ideal for secure international logistics.
Inner Packaging:
To safeguard the premium circuit breaker, it is cocooned in top-quality buffer materials such as foam pads, bubble film or pearl cotton to effectively absorb shocks and protect against vibrations and collisions during transit.
For larger circuit breakers, our innovative packaging includes a sophisticated layered design, with vital accessories like manuals, tools, and spare partsthoughtfully arranged on the upper layer for convenient accessibility and organization.
Domestic Transportation:
Should you have a preferred freight forwarder within China, rest assured as we will facilitate the smooth transportation of your products using road transportation or domestic express services, guaranteeing prompt delivery immediately after production completion.
International Transport:
For smaller, time-sensitive shipments destined for specific international locations, we trust in the exceptional services of the world's leading express companies:
DHL, FEDEX, and UPS.
Sea Freight/Air Freight:
For larger, less time-critical shipments, we choose sea freight. Our logistics team adeptly coordinates with a reliable freight company, arranging truck pickup and transport to the designated port for secure warehousing.Subsequently, the cargo is safely shipped by sea to the customer's specified port, ready for collection with an official bill of lading.
Mingtuo Electric Zhejiang Mingtuo Electric Technology Co., Ltd. has firmly established its leadership in the domestic market and is now boldly venturing into global territories. Known for unparalleled quality and innovation, our products are highly sought-after in construction, industrial, and energy sectors. Esteemed for executing numerous high-profile engineering projects, we have earned steadfast trust and admiration from our clientele.
The company adheres to the principle of prioritizing our customers, ensuring top-notch quality, delivering exceptional service, and maintaining a stellar reputation, and we are unwavering in our commitment to innovation and progress. Our company is built on a solid foundation characterized by remarkable technical expertise, state-of-the-art production techniques, and vast experience in research and development. We distinguish ourselves through our professionalism and technological prowess, equipped with an extensive array of the most sophisticated production, testing, and inspection tools available in China.
FAQ
Q: What is the product voltage/current range? What's the breaking ability?
A: For precise details on voltage, current range, and breaking capacity, we invite you to contact our customer service team for personalized assistance.
Q: What is the MOQ? Do you support sample ordering?
A: Our minimum order quantity is highly accommodating at just one set. We are delighted to offer sample orders to meet your specific needs and expectations.
Q: How long is the warranty period? How to apply for warranty?
A: A generous warranty period of one to two years is available for our products. To apply for warranty services, please contact our dedicated customer service team, who are eager to assist.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Absolutely, we proudly hold CE and RoHS certifications and are more than willing to provide these upon your request for your documentation needs.
Q: Does the price include tax/shipping?
A: Kindly be advised that our quoted prices do not include shipping and tax fees, ensuring transparent and straightforward transactions.
Q: What famous clients or project cases have you worked with?
A: We are honored to have collaborated with prestigious clients such as the State Grid of China, Chint Group, and Xiaomi Group, a testament to our unwavering dedication to excellence and dependability.